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4=d/2.5
We move all terms to the left:
4-(d/2.5)=0
We add all the numbers together, and all the variables
-(+d/2.5)+4=0
We get rid of parentheses
-d/2.5+4=0
We multiply all the terms by the denominator
-d+4*2.5=0
We add all the numbers together, and all the variables
-1d+10=0
We move all terms containing d to the left, all other terms to the right
-d=-10
d=-10/-1
d=+10
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